Substrate Targeted Ablation Using the FlexAbility™ Ablation Catheter System for the Reduction of Ventricular Tachycardia

Inclusion Criteria: * Patient is receiving a new St.Jude Medical (SJM) Implantable Cardioverter Defibrillator (ICD) or SJM Cardiac Resynchronization Therapy-Defibrillator (CRT-D) implant, which has study required programing capabilities and is appropriate for remote monitoring. Subjects who have received the ICD / CRT-D up to 90 days prior to enrollment are also eligible. * Patient who has a high risk of ICD shock as shown by at least one documented Monomorphic VT (MMVT)\*\* by one or more of the following: Spontaneous MMVT or Inducible MMVT during electrophysiology (EP) Study or Inducible MMVT during Non-Invasive Programmed Stimulation (NIPS) Study * 18 to 75 years of age * Patient has been informed of the nature of the study and has agreed to its provisions and provided written informed consent approved by the Institutional Review Board. * Note Pleiomorphic ventricular tachycardia (VT) (multiple MMVT morphologies) is acceptable but polymorphic VT or ventricular fibrillation (VF) is not. Exclusion Criteria: * Any history of stroke * S-T elevation myocardial infarction (MI) or previous cardiac surgery within 60 days prior to enrollment * Patient is pregnant or nursing * Patient has New York Heart Association (NYHA) class IV heart failure * Patient has incessant ventricular tachycardia (VT) necessitating immediate treatment (Patients with Incessant VT have continuous sustained VTs that recur promptly despite repeated intervention for termination over several (≥3) hours…